Virtualbox shared folder windows 2008

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Notify me of new comments via email. Notify me of new posts via email. Home About. Expertester Broad Spectrum Perspective. Stay updated via RSS. Share this: Twitter Facebook. Like this: Like Loading Kelvin51 says:. October 22, at pm. Jing says:. The Host key is normally the right control key. This will enlarge the size of the VM's display to the size of your host screen and mask out the guest operating system's background.

This provides the following advantages:. For example, to monitor VM performance and statistics. Arbitrary string data can be exchanged between guest and host.

This works in both directions. To accomplish this, Oracle VM VirtualBox establishes a private communication channel between the Oracle VM VirtualBox Guest Additions and the host, and software on both sides can use this channel to exchange string data for arbitrary purposes.

Guest properties are simply string keys to which a value is attached. They can be set, or written to, by either the host and the guest. They can also be read from both sides. In addition to establishing the general mechanism of reading and writing values, a set of predefined guest properties is automatically maintained by the Oracle VM VirtualBox Guest Additions to allow for retrieving interesting guest data such as the guest's exact operating system and service pack level, the installed version of the Guest Additions, users that are currently logged into the guest OS, network statistics and more.

Some of this runtime information is shown when you select Session Information Dialog from a virtual machine's Machine menu. A more flexible way to use this channel is with the VBoxManage guestproperty command. For example, to have all the available guest properties for a given running VM listed with their respective values, use this command:.

To query the value of a single property, use the get subcommand as follows:. To add or change guest properties from the guest, use the tool VBoxControl.

This tool is included in the Guest Additions. When started from a Linux guest, this tool requires root privileges for security reasons. The Guest Control File Manager is a feature of the Guest Additions that enables easy copying and moving of files between a guest and the host system. Other file management operations provide support to create new folders and to rename or delete files. The Guest Control File Manager works by mounting the host file system. Guest users must authenticate and create a guest session before they can transfer files.

At the bottom of the Guest Control File Manager, enter authentication credentials for a user on the guest system. Transfer files between the guest and the host system by using the move and copy file transfer icons. You can copy and move files from a guest to the host system or from the host system to the guest.

Click Close to end the guest session. The Guest Additions enable starting of applications inside a guest VM from the host system. This feature can be used to automate deployment of software within the guest.

For this to work, the application needs to be installed on the guest. No additional software needs to be installed on the host. Additionally, text mode output to stdout and stderr can be shown on the host for further processing. There are options to specify user credentials and a timeout value, in milliseconds, to limit the time the application is able to run. The Guest Additions for Windows allow for automatic updating. This applies for already installed Guest Additions versions. Also, copying files from host to the guest as well as remotely creating guest directories is available.

In server environments with many VMs, the Guest Additions can be used to share physical host memory between several VMs. This reduces the total amount of memory in use by the VMs. If memory usage is the limiting factor and CPU resources are still available, this can help with running more VMs on each host. The Guest Additions can change the amount of host memory that a VM uses, while the machine is running. Because of how this is implemented, this feature is called memory ballooning.

Oracle VM VirtualBox supports memory ballooning only on bit hosts. It is not supported on Mac OS X hosts. Memory ballooning does not work with large pages enabled. Normally, to change the amount of memory allocated to a virtual machine, you have to shut down the virtual machine entirely and modify its settings. With memory ballooning, memory that was allocated for a virtual machine can be given to another virtual machine without having to shut the machine down.

When memory ballooning is requested, the Oracle VM VirtualBox Guest Additions, which run inside the guest, allocate physical memory from the guest operating system on the kernel level and lock this memory down in the guest.

This ensures that the guest will not use that memory any longer. No guest applications can allocate it, and the guest kernel will not use it either. Oracle VM VirtualBox can then reuse this memory and give it to another virtual machine. The memory made available through the ballooning mechanism is only available for reuse by Oracle VM VirtualBox. It is not returned as free memory to the host. Requesting balloon memory from a running guest will therefore not increase the amount of free, unallocated memory on the host.

Effectively, memory ballooning is therefore a memory overcommitment mechanism for multiple virtual machines while they are running. This can be useful to temporarily start another machine, or in more complicated environments, for sophisticated memory management of many virtual machines that may be running in parallel depending on how memory is used by the guests.

At this time, memory ballooning is only supported through VBoxManage. Use the following command to increase or decrease the size of the memory balloon within a running virtual machine that has Guest Additions installed:. You can also set a default balloon that will automatically be requested from the VM every time after it has started up with the following command:.

By default, no balloon memory is allocated. This is a VM setting, like other modifyvm settings, and therefore can only be set while the machine is shut down. It avoids memory duplication between several similar running VMs. In a server environment running several similar VMs on the same host, lots of memory pages are identical. For example, if the VMs are using identical operating systems. Page Fusion currently works only with Windows and later guests.

The more similar the VMs on a given host are, the more efficiently Page Fusion can reduce the amount of host memory that is in use.

It therefore works best if all VMs on a host run identical operating systems. Instead of having a complete copy of each operating system in each VM, Page Fusion identifies the identical memory pages in use by these operating systems and eliminates the duplicates, sharing host memory between several machines. This is called deduplication. If a VM tries to modify a page that has been shared with other VMs, a new page is allocated again for that VM with a copy of the shared page.

This is called copy on write. All this is fully transparent to the virtual machine. You may be familiar with this kind of memory overcommitment from other hypervisor products, which call this feature page sharing or same page merging.

However, Page Fusion differs significantly from those other solutions, whose approaches have several drawbacks:. Traditional hypervisors scan all guest memory and compute checksums, also called hashes, for every single memory page. Then, they look for pages with identical hashes and compare the entire content of those pages. If two pages produce the same hash, it is very likely that the pages are identical in content. This process can take rather long, especially if the system is not idling.

As a result, the additional memory only becomes available after a significant amount of time, such as hours or sometimes days. It can therefore achieve most of the possible savings of page sharing almost immediately and with almost no overhead. Page Fusion is also much less likely to be confused by identical memory that it will eliminate, just to learn seconds later that the memory will now change and having to perform a highly expensive and often service-disrupting reallocation.

To enable Page Fusion for a VM, use the following command:. You can observe Page Fusion operation using some metrics. Enabling Page Fusion might indirectly increase the chances for malicious guests to successfully attack other VMs running on the same host. See Section The Guest Additions provide services for controlling the guest system's monitor topology. The resolution of a virtual monitor can be modified from the host side either by resizing the window that hosts the virtual monitor, through the view menu or through VBoxManage controlvm "vmname" setscreenlayout.

The decision is made automatically at each desktop session start. Since the mentioned monitor topology control services are initialized during the desktop session start, it is impossible to control the monitor resolution of display managers such as gdm, lightdm. Please refer to Section 4. When this guest property is set then VBoxDRMClient is started during the guest OS boot and stays active all the time, for both ithe display manager login screen and the desktop session.

Specifically, disabling a guest monitor except the last one invalidates the monitor topology due to limitations in the Linux kernel module vmwgfx. Chapter 4. Guest Additions. Table of Contents 4. Introduction to Guest Additions 4.

Installing and Maintaining Guest Additions 4. Guest Additions for Windows 4. For example:. Oracle VM VirtualBox provides the option to mount shared folders automatically. When automatic mounting is enabled for a shared folder, the Guest Additions service will mount it for you automatically. For Linux or Oracle Solaris, a mount point directory can also be specified. If a drive letter or mount point is not specified, or is in use already, an alternative location is found by the Guest Additions service.

The service searches for an alternative location depending on the guest OS, as follows:. Search for a free drive letter, starting at Z:. If all drive letters are assigned, the folder is not mounted. Linux and Oracle Solaris guests. See Section 4. Access to an automatically mounted shared folder is granted to everyone in a Windows guest, including the guest user.

For Linux and Oracle Solaris guests, access is restricted to members of the group vboxsf and the root user. All rights reserved. Legal Notices.